During Retro/Re-Commissioning Planning, which activity involves gathering needed information if existing documentation does not exist or is inaccurate?

• A. Review existing documentation, if available
• B. Carry out a survey to gather needed information
• C. Review system operation and control sequences in detail
• D. Prepare commissioning plan

Answer: (B)

When there’s no reliable documentation, the team must go out to collect new data directly from the site. Carrying out a survey to gather needed information is the activity that fills the gaps—you document as-built conditions, inventory equipment, locate sensors and actuators, verify control devices, and capture operating parameters and sequences from operators. This on-site data gathering creates an accurate baseline for retro-commissioning planning, ensuring later testing and adjustments are based on reality rather than guesses. Reviewing existing documentation can help when records exist, but it doesn’t resolve gaps if they’re missing or wrong. Detailing control sequences and preparing the commissioning plan are important steps, but they rely on the information obtained from the survey.